Four boulders will be placed to block trucks from the plaza on the east side of San Juan Capistrano’s Los Rios Park, which opened in August across from the train station, the City Council decided Tuesday night.

Signs also will be added to warn drivers away from the area.

Steven Rios, a lawyer whose family has inhabited the Los Rios District for generations, said the park is becoming a gathering point for people in the evenings, and “I think we need to address that.”

City planner Douglas Dumhart said the plaza was designed with “10 inches of brick, concrete and steel” to hold the weight of loading trucks that serve Los Rios businesses.

“We spent a boatload of money to make it truck-ready,” he said.

The City Council voted 4-1 to keep trucks away, with Councilman Lon Uso dissenting.

The council also voted 3-1 to set up a no-parking zone on Camino Lacouague where some San Juan Hills High School students are being dropped off. Councilman Tom Hribar voted no.

Uso, whose home is near the drop-off point, disqualified himself from voting and spoke as a citizen on the issue.

“Wait till the word gets out that you don’t have to hassle with Ortega (Highway) because the City Council will let you drop kids off on Lacouague,” Uso said in appealing for the no-parking zone.

Hribar called for tolerance for the 16 or so cars that use the drop-off point each weekday morning and afternoon.

“These are our residents … trying to make their day a little easier,” he said.

Following the vote, Uso addressed Hribar from the public-comment microphone.

Also at the meeting, the status of the Forster Mansion as an event destination was debated.

Nearby senior-housing residents have complained that the noise from weddings and other events at the historical house at 27182 Ortega Highway has been unbearable.

Mansion event supporters have used their own sound tests to dispute that.

Though the City Council addressed the issue only to decide whether to hold an additional hearing, many residents took the opportunity to discuss larger related questions, including criticizing what one called an excessively restrictive conditional use permit.

The Forster Mansion was built in 1910 for Frank A. Forster, grandson of John “Don Juan” Forster, who in the mid-1800s owned Mission San Juan Capistrano and one of the largest ranches in California.